<template>
  <div class="app-container">
    <el-form label-width="120px">
        <el-form-item label="信息描述">
            <el-tag type="info">excel模版说明</el-tag>
            <el-tag>
            <i class="el-icon-download"/>
            <a :href="'/static/01.xlsx'">点击下载模版</a>
            </el-tag>
        </el-form-item>

        <!-- limit：限制每次只能传一个文件  accept="application/vnd.ms-excel：限制上传的格式；-->
        <el-form-item label="选择Excel">
            <el-upload
            ref="upload"
            :auto-upload="false"
            :on-success="fileUploadSuccess"
            :on-error="fileUploadError"
            :disabled="importBtnDisabled"
            :limit="1"
            :action="BASE_API+'/eduservice/subject/addSubject'"
            name="file"
            accept=".xlsx">
            <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
            <el-button
                :loading="loading"
                style="margin-left: 10px;"
                size="small"
                type="success"
                @click="submitUpload">{{ fileUploadBtnText }}</el-button>
            </el-upload>
        </el-form-item>
    </el-form>
  </div>
</template>
<script>
    export default {
        data() {
            return {
                BASE_API: process.env.BASE_API, // 接口API地址
                //OSS_PATH: process.env.OSS_PATH, // 阿里云OSS地址
                fileUploadBtnText: '上传到服务器', // 按钮文字
                importBtnDisabled: false, // 按钮是否禁用,
                loading: false
            }
        },
        
        created() {

        },

        methods: {
            //单机按钮上传文件到接口里面
            submitUpload() {
                this.importBtnDisabled = true
                this.loading = true
                //js 原生 ：document.getElementById("upload")
                this.$refs.upload.submit()
            },
            //上传成功
            fileUploadSuccess() {
                //提示信息
                this.loading = false
                this.$message({
                    type: 'success',
                    message: '添加课程分类成功'
                })
                //跳转到课程分类列表
                this.$router.push({path: '/subject/list'})
            },
            //上传失败
            fileUploadError() {
                //提示信息
                this.loading = false
                this.$message({
                    type: 'error',
                    message: '添加课程分类失败'
                })
            }
        }
    }
</script>